WRS-56
Evapotranspiration by Phreatophytes in the North Platte Basin of Wyoming
Abstract
A survey of phreatophyte vegetation and its water usage was conducted for
the North Platte Basin of Wyoming. The study was limited
to the phreatophyte vegetation along the North Platte River and its
three main tributaries: the Laramie, Medicine Bow, and Sweetwater
Rivers.
An estimated 90 to 95% of the phreatophytes were either cottonwoods or
willows. Long-term annual average evapotranspiration rates
of .94, .81, and .67 m for high, medium, and low density vegetation,
respectively, were estimated using the Blaney-Criddle method. The
total estimated long-term annual evapotranspiration was 8,121 hectaremeters
for the four major rivers in the North Platte Basin of Wyoming.
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